a. Mario, who is single, earns wages of $413,200. His additional Medicare tax is $fill in the blank 1.

b. George and Shirley are married and file a joint return. During the year, George earns wages of $242,300, and Shirley earns wages of $363,450. Their additional Medicare tax is $fill in the blank 2.

c. Simon has net investment income of $55,760 and MAGI of $278,800 and files as a single taxpayer. Simon's additional Medicare tax is $fill in the blank 3.